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Volume 45 Issue 1
Jan.  2021
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WU Zhipeng, LI Yueqing, LI Xiaolan, et al. 2021. Influence of Different Planetary Boundary Layer Parameterization Schemes on the Simulation of Precipitation Caused by Southwest China Vortex in Sichuan Basin Based on the WRF Model [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 45(1): 58−72 doi: 10.3878/j.issn.1006-9895.2005.19171
Citation: WU Zhipeng, LI Yueqing, LI Xiaolan, et al. 2021. Influence of Different Planetary Boundary Layer Parameterization Schemes on the Simulation of Precipitation Caused by Southwest China Vortex in Sichuan Basin Based on the WRF Model [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 45(1): 58−72 doi: 10.3878/j.issn.1006-9895.2005.19171

Influence of Different Planetary Boundary Layer Parameterization Schemes on the Simulation of Precipitation Caused by Southwest China Vortex in Sichuan Basin Based on the WRF Model

doi: 10.3878/j.issn.1006-9895.2005.19171
Funds:  National Natural Science Foundation of China (Grants 91937301, 42030611), The Second Tibetan Plateau Scientific Expedition and Research (STEP) Program (Grants 2019QZKK0103, 2019QZKK0105); Cooperation Project between Sichuan Provincial Meteorological Bureau and Nanjing University of Information Science–Technology (Grant SCJXHZ03); Sichuan Provincial Science and Technology Project (Grant 2016JY0046)
  • Received Date: 2019-06-13
  • Accepted Date: 2020-06-10
  • Available Online: 2020-06-11
  • Publish Date: 2021-01-19
  • Five planetary boundary layer (PBL) parameterization schemes [Yonsei University (YSU), Mellor–Yamada–Janjic (MYJ), Mellor–Yamada–Nakanishi–Niino Level 2.5 (MYNN2), Shin-Hong (SH), and the asymmetric convective model, version 2 (ACM2)] in the Weather Research and Forecast model (WRF v4.0), were used to simulate all well-developed Southwest China vortex (SWCV) processes in the eastern Sichuan basin in 2016. Each level of precipitation prediction was verified, and the L-band radiosonde data with temporal resolution of 1 s were used to reveal the fine structure of the PBL during a midday. The differences between the observation and simulation are assessed, and the reasons are discussed based on the characteristics of the turbulence algorithm used in each scheme. Finally, the parameter of turbulence intensity was adjusted for the ACM2 scheme to improve the structure of the PBL that influences the simulation of the precipitation in the eastern Sichuan basin. The results show that the ACM2 and YSU schemes show a relatively better TS performance. Compared with other schemes, ACM2 has fewer false alarms. The attribute of ACM2 that can modify local or nonlocal algorithms according to the stability of the surrounding environment seems to be more suitable for the Sichuan basin precipitation simulation than the other schemes. However, all PBL schemes show a high false-alarm rate in the prediction of the SWCV precipitation, especially when the precipitation is heavy. The sounding data with 1 s temporal and 3 m spatial resolution further show that all the PBL schemes predict a higher PBL height compared with that of the observations, which means that the simulation has a stronger mixing intensity compared with that of the real atmosphere. By parameter adjustment, using the ACM2 scheme with reduced mixing intensity, the potential temperature and humidity structure in PBL are more aligned with the observations. Further, the potential temperature of the low PBL is low, humidity is high, and false alarm reports of heavy precipitation are reduced, which leads to an improvement regarding the precipitation simulation in the Sichuan basin. The different characters of the PBL schemes that are used in the simulation of the SWCV mainly lead to different positions of the vortex and precipitation intensity. Essentially, these characters are derived from a local or nonlocal attribute and the intensity of vertical mixing. A selection based on regional features of a research object is the key to the accurate simulation of a PBL structure and precipitation process.
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